writer.go

package zerolog

import (
	"io"
	"sync"
)

// LevelWriter defines as interface a writer may implement in order
// to receive level information with payload.
type LevelWriter interface {
	io.Writer
	WriteLevel(level Level, p []byte) (n int, err error)
}

type levelWriterAdapter struct {
	io.Writer
}

func (lw levelWriterAdapter) WriteLevel(l Level, p []byte) (n int, err error) {
	return lw.Write(p)
}

type syncWriter struct {
	mu sync.Mutex
	lw LevelWriter
}

// SyncWriter wraps w so that each call to Write is synchronized with a mutex.
// This syncer can be used to wrap the call to writer's Write method if it is
// not thread safe. Note that you do not need this wrapper for os.File Write
// operations on POSIX and Windows systems as they are already thread-safe.
func SyncWriter(w io.Writer) io.Writer {
	if lw, ok := w.(LevelWriter); ok {
		return &syncWriter{lw: lw}
	}
	return &syncWriter{lw: levelWriterAdapter{w}}
}

// Write implements the io.Writer interface.
func (s *syncWriter) Write(p []byte) (n int, err error) {
	s.mu.Lock()
	defer s.mu.Unlock()
	return s.lw.Write(p)
}

// WriteLevel implements the LevelWriter interface.
func (s *syncWriter) WriteLevel(l Level, p []byte) (n int, err error) {
	s.mu.Lock()
	defer s.mu.Unlock()
	return s.lw.WriteLevel(l, p)
}

type multiLevelWriter struct {
	writers []LevelWriter
}

func (t multiLevelWriter) Write(p []byte) (n int, err error) {
	for _, w := range t.writers {
		if _n, _err := w.Write(p); err == nil {
			n = _n
			if _err != nil {
				err = _err
			} else if _n != len(p) {
				err = io.ErrShortWrite
			}
		}
	}
	return n, err
}

func (t multiLevelWriter) WriteLevel(l Level, p []byte) (n int, err error) {
	for _, w := range t.writers {
		if _n, _err := w.WriteLevel(l, p); err == nil {
			n = _n
			if _err != nil {
				err = _err
			} else if _n != len(p) {
				err = io.ErrShortWrite
			}
		}
	}
	return n, err
}

// MultiLevelWriter creates a writer that duplicates its writes to all the
// provided writers, similar to the Unix tee(1) command. If some writers
// implement LevelWriter, their WriteLevel method will be used instead of Write.
func MultiLevelWriter(writers ...io.Writer) LevelWriter {
	lwriters := make([]LevelWriter, 0, len(writers))
	for _, w := range writers {
		if lw, ok := w.(LevelWriter); ok {
			lwriters = append(lwriters, lw)
		} else {
			lwriters = append(lwriters, levelWriterAdapter{w})
		}
	}
	return multiLevelWriter{lwriters}
}